Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e8ca9559acf9a2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 04:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a7c4dff437a9b5502a6d80fec96360d1 SHA-1: 8a03282bbfb41c7b8da1dac58230ab8d8ef7fc20 SHA-256: 13e8ca9559acf9a24f48bfc72a1bbfc4e78af71089f531f31e3501a1ef179563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and embedded URLs point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/urji4cath2phngjrl3clavis4c/jakuvunutajima.pdf In PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/gunawulawudas.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/u37klsfeqhagbrh55a9a9h2vfj/sivivajosagidaladiba.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/dasivafud.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9665b30cc1---zipitowiv.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/nofefeduker.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/89232954377.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663a384a69---gofirud.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9mi9k19uj3mj25jfqe50cas53n/16621850422.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b47efbd9efc---pelenijefav.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160afc59150d53---55952313548.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/tarut.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8svcceft9oarkec9d7hmplvrj5/jaxatewobexufudevatotek.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fdfbda5372---23803066645.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/wibukulikakolewizugu.pdfIn PDF document text
    • https://carlojans.com/cms/file/95656589726.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051401474773499.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e875326e---10797003149.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/pewekudabizel.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/bobebajawuvixe.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/30495892242.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ba87bb14---97404357821.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/89296738633.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/tovijulixovonalurun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=extortion+of+money+blackmailPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 17384 bytes
SHA-256: 3d093a0017acb5cc042a31e856e8861535c19c0ac8b1a757d4cad3c70b6ed034
font_01_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 10760 bytes
SHA-256: 0273438b813b0dcbaee8800919aa158dcfec38386faab940da5d973cdf3cebf9
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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